Question

I have a gridview when i click on any image i send current index of that gridview so i can see that image. and I am loading images from doucment.
below is my viewDidload code.
but what my problem is. when i click any gridview item . let say its index is 4. and i set it here in currentpage=4. so when i open this page. it shows me 4th image. but my page controller current page is 4 but i can see my image which was at index 1.

- (void)viewDidLoad {
    [super viewDidLoad];

    pageControlBeingUsed = NO;
    UIImageView *subview;
    //NSArray *colors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor], [UIColor orangeColor],[UIColor blueColor], nil];
    for (int i = 0; i < (NSInteger)totalImagesInGrid; i++) {
        CGRect frame;
        frame.origin.x = self.scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;

        subview = [[UIImageView alloc] initWithFrame:frame];
        //subview.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:[tableDataArray objectAtIndex:i]]];
        NSString *name = [tableDataArray objectAtIndex:(NSUInteger)i];
        NSFileHandle* myFileHandle = [NSFileHandle fileHandleForReadingAtPath:name];
        UIImage* loadedImage = [UIImage imageWithData:[myFileHandle readDataToEndOfFile]];
        subview.image = loadedImage;
        [self.scrollView addSubview:subview];
        [subview release];
    }
    //float count = [totalImagesInGrid floatValue];
    self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * 13, self.scrollView.frame.size.height);
    self.pageControl.currentPage = (NSInteger)currentImage;
    NSLog(@"currentPage  %d",(NSInteger)currentImage);
    self.pageControl.numberOfPages = (NSInteger)totalImagesInGrid;
    NSLog(@"(NSInteger)totalImagesInGrid  %d",(NSInteger)totalImagesInGrid);
}

- (void)scrollViewDidScroll:(UIScrollView *)sender {
    if (!pageControlBeingUsed) {
        // Switch the indicator when more than 50% of the previous/next page is visible
        CGFloat pageWidth = self.scrollView.frame.size.width;
        int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
        self.pageControl.currentPage = (NSInteger)currentImage + page;
        NSLog(@"Page %d",page);
    }
    NSLog(@"scrollViewDidScroll");
}

- (IBAction)changePage {
// Update the scroll view to the appropriate page
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
[self.scrollView scrollRectToVisible:frame animated:YES];


pageControlBeingUsed = YES;

}

this is my gridview and i m click on (1,1) image.

And this is my page control view. but thats not the image i have selected . this is (0,1) image but see at page control it is on index 2.

Answer 1

set page index with selectedIndex of gridview for example see bellow…

- (void) gridView:(UIGridView *)grid didSelectRowAt:(int)rowIndex AndColumnAt:(int)colIndex{
    ///set Image with index of colIndex..
    int selectedIndex = (rowIndex*4)+colIndex;
    NSLog(@"\n Selected Image Index is %d",selectedIndex);
}

and in SecondView Class’s viewDidLoad: just call your secondView class method changePage at last of the method like bellow

- (void)viewDidLoad {
    ////another your code
    [self changePage] 
}

i hope this help you..